This This wear resistant nozzle by Micro Swiss suits a range of printers has an M7 thread and 0.4mm hole.

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It has a Wear Resistant High Lubricity TwinClad XT Coating this makes it a excellent choice when printing with abrasive/wearing material such as Bronze, Copper, Alumininium or Carbon Fiber filament. TwinClad XT is a nickel composite coating for very low frction. Over a 360 brass base, it gives a lower coefficient of friction than PTFE (Teflon) over nickel